Quize 2

Question 1

what does the silane coupling agent do

Answer 1

without it the wear resistance is cut in half

Question 2

what has more wear resistance

Answer 2

Microhybrid

Question 3

what has the most shrinkage

Answer 3

microfill

Question 4

microfills in regard to filler material and polymer matrix

Answer 4

less filler

more polymer

Question 5

microfill will _____ more _____

Answer 5

absorb, water

Question 6

microfill will have a _____ surface

Answer 6

softer

Question 7

what type of material do you use when concerned with esthetics

Answer 7

microfilled

Question 8

what numbers represent round burrs

Answer 8

1/4th through 8 (will probably be four)

Question 9

what implications does a negative rake angle have

Answer 9

rake face is ahead of the radius

Question 10

In the fisher burr, increased clearance causes?

Answer 10

decreased edge

Question 11

in the fisher burr, increase rake causes

Answer 11

increased edge

Question 12

what is the effect of the coefficient of thermal expansion on microhybrids on microcomposits

Answer 12

microfilled has more polymer which means more expansion

Question 13

most common photo absorbing material

Answer 13

camphorquinone (blue range 460 - 470)

Question 14

Irradiance

Answer 14

number of photons per second emmited by the light source

Question 15

energy

Answer 15

flux times time

Question 16

energy density

Answer 16

irradiance times time

Question 17

what is the purpose of etching

Answer 17

forms macro and micro tags
removes smear layer

(removes hydroxy apatite from outer dentin, exposes collagen sponge later, exposes dentin tubules, frosty apearance)

Question 18

importance of collagen later in the tooth and why we do not dry it our

Answer 18

if it dries, it collapses on itself

which would prevent penetration by the primer and bonding will fail

Question 19

what is the hybrid layer and the bonding technique

Answer 19

impregnation of the etched dentin by the resin in the primer

formed by the primer

Question 20

components of all bonding systems

Answer 20

• conditioner (etch)
• Primer
• Adhesive (bonding)

Question 21

components of composite material

Answer 21

• polymer matrix
• filler perticles
• coupling agents
• initiator-accelerator system

Question 22

where is HEMA found

Answer 22

In the primer

Question 23

what does the HEMA molecule look like

Answer 23

nydrophobic (bonding agent) and hydrophilic (dentin) ends (bi-functional monomer)

Question 24

reciprocity

Answer 24

increased radiance = decreased time

Question 25

where would you find the most inreacted double carbon bonds in a cured carbon restorative material

Answer 25

Air inhibited surface layer

Question 26

composite restorative materials are polymerized by what polymerization process

Answer 26

free radical polymerization